Two bombs exploded outside a court building in Russia’s restive province of Dagestan on Monday, killing at least four people and wounding dozens of others, officials said.

The first bomb exploded in a parked car and the second went off in a trash bin about 15 minutes later after police had arrived on the scene in Makhachakala, the provincial capital, according to Interior Ministry spokesman Vyacheslav Gasanov. He said the second blast, which was much more powerful, caused all of the casualties and many of those killed and wounded were police.

Health officials in Dagestan said about 45 people were taken to various hospitals for treatment. The federal Health Ministry in Moscow later said 35 people were hospitalized.

Investigators said it appeared that both explosions were set off by remote control.

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Two separatist wars in Chechnya killed tens of thousands of people and spawned an Islamic insurgency that has engulfed the entire region, mainly neighboring Dagestan.